WestCat Basic Search
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Subject headings are a controlled vocabulary. A single term or phrase is determined by an authority (Library Congress or a database vendor) to describe a subject. For example, try searching for the subject "roaring twenties" in West-Cat and see what you get.
A controlled vocabulary is a list of of predefined, authorized terms that have been selected by the designer of the vocabulary. Natural language vocabularies occur where there is no restriction on the words used.